It means that the http server at cw.na1.hgncloud.com send some http headers to tell web browsers like Chrome to allow iframe loading of that page (https://cw.na1.hgncloud.com/crossmatch/) only from a page hosted on the same domain (cw.na1.hgncloud.com) :
Content-Security-Policy: frame-ancestors 'self' https://cw.na1.hgncloud.com X-Frame-Options: ALLOW-FROM https://cw.na1.hgncloud.com
You should read that :
- https://developer.mozilla.org/en-US/docs/Web/Security/CSP
- https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy
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